ArrAdSubMul, C++ (gcc)

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//g++  7.4.0

//write and test functions that add, subtract and multiply element-wise 2 one-dimensional int arrays of the same size 
//this code is created by Rezaul Hoque on June 21,2021;contact: jewelmrh@yahoo.com
//note: codes shared by Rezaul Hoque on rextester are not for sale; they are created and shared to facilitate the algorithm learning process; many like Hoque use this platform to practice programming ;Rezaul hopes his contribution helps others to fine tune their  learning;

#include <iostream>
using namespace std;
int m=6, n=6;
int add(int [],int [],int , int );
int sub(int [], int [], int, int);
int mul(int [], int [], int, int);
int add(int a[],int b[],int m , int n){
int c[m]={0,0,0,0,0,0};//resultant array to hold the sum of a[] and b[]
int i;

for(i=0;i<m;i++)
c[i]=a[i]+b[i];
for(i=0;i<m;i++)
cout<<" "<<c[i];
}
int sub(int a[],int b[],int m , int n){
int d[m]={0,0,0,0,0,0};//resultant array to hold differences between a[] and b[]

int i;
for(i=0;i<m;i++)
d[i]=a[i]-b[i];
for(i=0;i<m;i++)
cout<<" "<<d[i];
}
int mul(int a[],int b[],int m , int n){
int e[m]={1,1,1,1,1,1};//resultant array to hold the product of a[] and b[]
int i;
for(i=0;i<m;i++)
e[i]=a[i]*b[i];
for(i=0;i<m;i++)
cout<<" "<<e[i];
}
int main()
{
int a[m]={7,6,5,4,3,2};
int b[n]={1,2,3,4,5,1};
cout<<"Array holding sum of a and b:\n"<<add(a,b,m,n)<<"\n";
cout<<"Array holding differences between a and b:\n"<<sub(a,b,m,n)<<"\n";

cout<<"Array holding product of a and b:\n"<<mul(a,b,m,n)<<"\n";

return 0;
}

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Compilation time: 1.05 sec, absolute running time: 0.17 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 1,31 sec